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Connecting monoblock tube amps to single subwoofer.

Hi all,

I have added a REL5TX sub to my system which is driven by VTL225 monoblocks.Currently the sub and amps are connected via the low level outputs on my preamp. I would prefer to use the high level connection to the REL by direct  connection to the the VTLs. I am concerned about creation of a ground loop that will cause hum on the system. I have been told that the ground loop can be avoided by running a ground wire directly between each amp. Is this a possible solution, and if so, where / how should the ground "jumper" be connected to each monoblock?

Many thanks in advance for any comments or suggestions.

128x128rbanathy
ieales's avatar
ieales
1,201 posts
 

the addition of a second sub is exponentially harder to set up, with the blend and the correct positioning, than just one sub.

 

Nope

ps
744 posts
 

There are but two kinds of people in this and other worlds, the yup's and the nope's

rbanathy's avatar
rbanathy OP
13 posts
 

Connecting monoblock tube amps to single subwoofer

Hello to all, and Happy Friday.

I connected the high level outputs of the VTL monoblocks to the REL5TX. The high level connection was made by running the red and yellow wires separately to the positive terminals to each monoblock, and connecting the black wire to the negative terminal on one of the amps.Happy to report that, at least in my system, no hum. Results may well be different with other components (I run the VTL MB 225 monoblocks, driven by a Rogue 99 Magnum pre) Completely happy with the performance, and hope this may be a solution for others with a similar setup.

daveyf's avatar
daveyf
2,835 posts
 

@ps   +1000

 

 

@ieales   I guess that depends on how you want a pairing to sound, if you just plop them down anywhere, yeah you are right... no problem. ( Nope). OTOH, IF you want an invisible blend with your mains...then yup! 🤔

ieales's avatar
ieales
1,201 posts
 

I've been setting up subs in systems for decades. Today with room correction and tools like REW, setting up two subs is actually easier than one.

My room is ±5dB from 20Hz. Show me a plot of your room and then we'll talk.

Assuming the op means he has a T/5x, setup is going to be very, very difficult:

  • No continuous phase control
  • No polarity inversion
  • No crossover order
  • No delay

If he has ported mains, fuhgeddaboudit.

See Subterranean Homesick Blues Guide to Subwoofers

As a composer once said of one of my systems:

"Those little speakers aren't putting out all that gorgeous bass?!?!?!?!?"

- No, there's a Force subwoofer at the end of the sofa. - 

"Every other subwoofer I've ever heard just boomed!"

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